Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

Best Black Friday E-Bike Deals 2024 | Up to $1,700 in Savings

New: Take Part in the November Giveaway: Starts November 18th


Trek 4300 bottom bracket
#1
Anyone know the make/size bottom bracket for a 2005 trek 4300 bike.
It has the stock crank set SR, 24/34/42 teeth.
The BB SHELL measures 73mm and is square tapered fit.

Thanks..
  Reply
#2
if you have it, just measure it. A Shimano UN54/55 is a good replacement for not a lot of money.
Nigel
  Reply
#3
The 73 mm is correct. To add to Nigels advice, make sure you get a BB with English Thread and not Italian. The UN54 can be had in both.
73 is your shell width. The next important number is your axle (spindle) length. It might say '73-113' in the description. You'll have to pull the crankarms to measure this. If the crankset were Shimano, we could easily find what length was required. As it's SR, a bit more difficult.
If I were a betting man, I'd bet on 73-122. SunRace stuff seems to run wide. What diameter is your seat tube? What front drlr?
Wheelies don't pop themselves. (from a QBP fortune cookie)
  Reply
#4
Impossible to have a Italian thread on a Trek, it should be English...
  Reply
#5
(04-02-2012, 08:44 PM)bobtravers Wrote:  Impossible to have a Italian thread on a Trek, it should be English...
But, but, but Bob! It's not impossible to have an unknowing LBS rat just pull a BB off of the shelf and sell you the wrong item and then want to charge you to clean up the thread damage that YOU did by attempting to install the wrong BB. Never happens in my shop but, I've heard stories. Just looking out for rocky. Dig?
Wheelies don't pop themselves. (from a QBP fortune cookie)
  Reply
#6
Euh, that's why people are asking question on this forum when they do not know the answers... Officially, a Italian thread BB wouldn't fit installing it with your hands...

Your answer is almost the same as: is it possible to run a car motor with sand instead of oil inside, cause the mechanic didn't look at the right bottle to put in???
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
Recording Bike Rides
Yesterday 01:37 AM
Ketone Ester $$$
11-19-2024 01:04 AM
Trek domane tyre
11-18-2024 01:58 PM
Old fossil buys Ebike
11-17-2024 06:39 AM
Bike bus
11-17-2024 12:14 AM
Second wheelset for ebike.
11-16-2024 08:20 PM
Humber "Eiffel Safety" bike 1800s
11-16-2024 03:05 PM
Moving in Style: Beyond Regular Transpor...
11-15-2024 03:01 PM
Great UK Cycle Camping Map, For E-Bikes,...
11-10-2024 06:55 AM
Cycling is Anti-Aging, But There's a Cat...
11-10-2024 06:48 AM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Jesper
22 posts
no avatar 2. enkei
20 posts
no avatar 3. GirishH
14 posts
no avatar 4. ReapThaWhirlwind
11 posts
no avatar 5. Flowrider
11 posts